Multiple needle thread trimmer



ZIB-

July 7, 1964 s. M. CQHEN ETAL 3,139,849

MULTIPLE NEEDLE THREAD TRIMMER Filed Aug. 7, 1961 5 Sheets-Sheet 1 July7, 1964 s. M. COHEN ETAL 3,139,849

MULTIPLE NEEDLE THREAD TRIMMER Filed Aug. 7, 1961 5 Sheets-Sheet 2INVENTOR s .S'A Ut M. Vo/5N FRE MRW J1 KEA/7 adam' BZ. 2W

July 7, 1964 s. M. COHEN ETAL MULTIPLE NEEDLE THREAD TRIMMER Filed Aug.7, 1961 5 Sheets-Sheet 5 ATTORNEY July 7, 1.964 s, M, COHEN ETAL3,139,849

MULTIPLE NEEDLE THREAD TRIMMER Filed Aug. 7, 1961 5 Sheets-Sheet 4 ATTORNEY July 7, 1964 s. M. COHEN Em. 3,139,849

MULTIPLE NEEDLE THREAD TRIMMER Filed Aug. 7. 1961 4 40 a9 4/ T1 -14- 8&2f2

INVENTOR s M'. Hof/5N wizamf.

ATTORNEY United States Patent O 3,139,849 MULTIPLE NEEDLE THREAD TRIMMERSaul M. Cohen, Paramus, and Frederick J. Kent, Glen Rock, NJ., assignorsto Clinton Industries, Inc., New York, N.Y., a corporation oit' New YorkFiled Aug. 7, 1961, Ser. No. 129,701 11 Claims. (Cl. '112 252) Thepresent invention relates generally to improvements in sewing machines,and it relates particularly to an improved automatic thread cuttingmechanism.

In commercial sewing operations employing conventional sewing machinesof various types, frequent severing of sewing threads attendant thesewing sequences is necessary but is highly time consuming and therebycontributes appreciably to the cost of the end product. Many forms ofthread cutting devices have been suggested and used, but these havepossessed numerous drawbacks and disadvantages. Among the drawbacks ofthe automatic thread cutting mechanisms heretofore employed is theirlimited application and adaptability. For example, these cuttingmechanisms cannot be used with needle feed, lock-stitch sewing machinesand for practical reasons cannot be used with multiple needle machines.

It is, therefore, a principal object of the present invention to providea sewing machine with an improved automatic thread cutting mechanism.

Another object of the present invention is to provide an improvedautomatic thread cutting mechanism in a needle feed, lock-stitch sewingmachine.

Still another object of the present invention is to provide an improvedautomatic thread cutting mechanism in a multiple needle sewing machine.

A further object of the present invention is to provide an improvedsewing machine, automatic thread cutting mechanism of the above naturecharacterized by its versatility, adaptability, ruggedness, simplicityand ease of application.

The above and other objects of the present invention will becomeapparent from a reading of the following description, taken inconjunction with the accompanying drawings, wherein FIGURE l is afragmentary bottom plan view of a two-needle, needle feed, lock stitchsewing machine constructed according to and embodying the presentinvention;

FIGURE 2 is an enlarged sectional view taken along line 2 2 in FIGURE l;

FIGURE 3 is a sectional View taken along line 3 3 in FIGURE 2;

FIGURE 4 is a sectional View taken along line 4 4 in FIGURE 2;

FIGURE 5 is a sectional view taken along line 5 5 in FIGURES 1 and 2;

FIGURE 6 is a sectional View, partially broken away, taken along line 66in FIGURE 5;

FIGURE 7 is a sectional View taken along line '7 7 in FIGURE 6;

FIGURES 8 to 10 inclusive are sectional views taken along line 8 8 ofFIGURE 6 at different stages of the machine operating cycle;

FIGURE 11 is a top plan fragmentary view of a` sewing machine foot pieceand upper thread cutting assembly;

FIGURE 12 is a sectional View taken along line 12-12 of FIGURE 11;

FIGURE 13 is a sectional View taken along line 13 13 of FIGURE 11;

FIGURE 14`is a fragmentary'top plan view of a top thread cutting elementduring its advance stroke;

FIGURE 14a is a sectional view taken along line 14a-14a of FIGURE 14;

FIGURES 15, 16 and 17 are views similar to FIG- URE 14, illustrating thecutter element in successive stages of the cutting stroke;

FIGURE 16a is a sectional view taken along line 16a 16a of FIGURE 16;and

FIGURE 17a is a sectional view taken along line 17a-17a of FIGURE 17.

While the mechanism of the present invention is advantageously employedin a sewing machine of the two needle, lock stitch, needle feed type andis so illustrated and described herein, it may be used to greatadvantage in other types of sewing machines, of the single or multipleneedle type and of different stitch and feed types.

A feature of the present invention resides in the pro vision of a threadcutting device in a sewing machine including a reciprocating needle,comprising a cutter element longitudinally movable along a pathintersecting the path of said needle and including a front sectionhaving a leading side edge inclined to the longitudinal path of saidcutter element and a rearwardly directed cutterdefining trailing edge,and means for reciprocating said cutter element along said longitudinalpath. Another feature of the present invention is achieved by providing,in a sewing machine including a reciprocating work advancing feed dog, athread cutting member movable with said dog and means for moving saidthread cutting member relative to said feed dog.

According to a preferred form of the present invention, as embodied in atwo needle, needle feed, lock stitch sewing machine, there are provideda foot piece which defines a bottom guide plate and a top` guide platemounted on and above the bottom guide plate, the guide plates havinglaterally spaced pairs of vertically aligned slots formed therein toaccommodate the conventionally reciprocated, laterally spaced needles. Acutter assembly is longitudinally slidably located between the guideplates and includes a rear cross bar to which is secured a pair oflaterally spaced, longitudinally extending thread engaging and cuttingmembers. Each thread cutting and thread engaging member has a lowercutter element resting on the bottom guide plate and provided with afront section having a leading side edge inclined to the longitudinalaxis of the cutter element and a trailing rearwardly directed cuttingedge, and an upper thread engaging element provided with a front sectionwhich is resiliently urged upwardly into'engagement with the top guideplate and has a leading inclined side edge aligned with the cutterelement side edge and a rearwardly directed hook shaped edge trailingthe cutting edge of the lower cutter element. Means are provided toreciprocate the cutter assembly so that the cutter and thread engagingelement front sections move across the needle registering aperturesformed in the guide plates.

The sewing machine is provided with a pair of coupled feed dogs drivenin a conventional manner and each having a serrated upper face and aconcave cylindrical bottom face. A first bell crank is supported belowand movable with the feed dogs and includes a depending first leg and alongitudinally extending second leg and is pivoted about a horizontalaxis. An arcuate cutter element is mounted on the second leg and isswingable along the feed dog cylindrical underface and across the needleaperture formed therein. The cutter element is provided with a leadingsection having a recess at its leading end and having formed in itsupper surface a longitudinal groove with a base disposed below the feeddog cylindrical surface. Trailing the leading section of the cutterelement is a cutting edge which defines the trailing end of the grooveand surface of the feed dog. A second bell crank is pivoted about aVertical axis mov able with the feed dog and includes a laterallyextending leg connected to the depending leg of the first bell crank anda longitudinally extending leg connected to a motivating means. Thecutting members are simultaneously selectively activated when theneedles are in their raised position by any suitable mechanism. One suchmechanism, which may be advantageously employed, is described in U.S.Patent No. 2,914,010, granted November 24, 1959, to Saul M. Cohen.

Referring now to the drawings, which illustrate a preferred embodimentof the present invention, reference numeral designates generally the bedplate of a two needle, needle feed, lock stitch sewing machine which,except as hereinafter described, may be of conventional construction. Aninsert plate 11 is located in bed plate 10 at the throat of the machine,and has an opening 12 formed therein in alignment with the sewingmachine feed dogs and needles. The sewing machine includes a needle bar13 which is vertically and longitudinally reciprocated in the usualmanner and releasably carries a pair of laterally spaced needles 14. Avertical foot piece sup- 'port bar 16 slidably registers with a bushing17 carried by the sewing machine and may be selectively manipulated, asis well known, to a raised position and a workengaging depressedposition. Mounted on bar 16 is a bracket 18 which includes an uprightleg locked in a vertical slot in bar 16 and a pair of forwardlyprojecting, laterally spaced arms terminating in dependent andtransversely apertured fingers, indicated at 20.

Rockably supported by bracket 18 above plate opening 12 is the upperthread cutting assembly 21 which is movable with bar 16 to a raisedposition above plate 11 and to a depressed position spring-urged towardplate 11. Assembly 21 includes a longitudinally extending bottom guideplate or foot piece 22 which is upwardly forwardly inclined at itsleading end 23 and has formed therein a pair of laterally spaced needleslots 24 extending longitudinally a distance slightly in excess of thefull longitudinal stroke of needles 14. Mounted on bottom guide plate 22and spaced vertically therefrom is a top guide plate 26 provided withdepending side flanges 27 which rest on the top face of bottom plate 22,plates 22 and 26 being secured by screws 27. The underface of the rearsection of the plate 26 is vertically upwardly offset relative to theunderface of the front section thereof to delineate with the plate 22front and rear longitudinally extending communicating passageways 28 and29 of smaller and greater heights respectively. A pair of needle slots30 are formed in top plate 26 coextensive and in alignment with needleslots 24. As seen in FIGURE 12, the upper trailing edges 32 of needleslots 24 are sharp to define cutting edges, whereas the lower trailingedges 33 of slots 30 are rounded to define non-abrading thread guideedges. A pair of laterally spaced transversely apertured lugs 34 projectupwardly from plate 26 and are pivoted to bracket fingers by headed pins36 to permit the rocking of assembly 21.

An upper thread engaging and cutting member 37, located andlongitudinally slidable in passageways 28 and 29, includes a rearcross-bar 38 which registers with trailing passageway 29. A pair oflaterally spaced complementary pairs of upper and lower thread engagingand thread cutting elements 39 and 40 respectively extend forwardly fromcross-bar 38 and have their coinciding superimposed trailing endssecured to the underface of the cross-bar 38 by countersunk rivets 41.Each of the thread cutting elements rests on lower plate 22, and isproved with a longitudinally extending outer edge 42 which is closelyspaced from the corresponding flange 27 to restrict cutter member 37 tofree longitudinal movement. The inner edges 43 of the cutter elements 40are forwardly outwardly inclined and terminate in rearwardly directedhook shaped edges 44 which define the trailing parts of the frontsections of said elements 40. The leading edge 46 of each element 40, inlongitudinal alignment with the corresponding needle slot 24, isforwardly outwardly inclined. As illustrated in FIGURE 16, the

bottom corner of the rearwardly directed hook shaped edge 44 is sharpand cooperates with the sharp needle slot edge 32 to provide a cuttingsystem. The other edges of cutter 40 which engage the thread arerounded.

Each thread engaging element 39 is of substantially the sameconfiguration as the corresponding underlying cutter element 40 exceptthat the rearwardly directed hooked edge 48 trails the hooked edge 44 ofcutter element 40. The other edges of thread engaging element 39 are insubstantially vertical alignment with the corresponding edges of theunderlying cutter elements 40. The trailing sections of cutter elements39 and 40 are in abutting engagement while the leading section of eachcutter 39 is upwardly sprung and disposed above the leading section ofcutter 40, the front edge of cutter 39 bearing against the underface ofthe top guide plate 26. A yoke member 49 defined by a pair oftransversely apertured upright lugs is medially located along the rearedge of cross bar 38.

The mechanism for actuating cutter assembly 37 includes a split collarblock 50 registering with and locked about bar 16 by a shouldered screw51 engaging a corresponding shoulder and tapped bore formed in block 50.Swingably supported by block 50 is a rockable yoke 52 which consists ofvertically extending, laterally spaced arms 53, pivoted at their upperends to block 50 by shouldered screw 51 and an opposite shouldered screw54, and terminating at their lower ends in rearwardly directed legs 56bridged by a cross piece 57. Integral with cross piece 57 and mediallydepending therefrom is an arm 58 having a forwardly projecting finger59, the extremity of which is folded rearwardly, as indicated at 60. Avertical bore is formed in finger 59 and section 60, slidably engaging apin 61, the lower end of which is pivoted to yoke 49.

Formed integrally with the upper end of one yoke arm 53 is a rearwardlydirected bar 63 having an aperture 64 formed adjacent the end thereof. Abell crank 65 has an opening formed in its knee portion which engagesthe outer reduced section of a stepped collar spacer member 66 mountedon block 50 by a shoulder screw 67. Bell crank 65 includes a laterallyprojecting leg 68 terminating in a coupling ball 69 which registers withaperture 64 in bar 63, and a vertically projecting longer leg 70carrying adjacent its upper end a rearwardly directed pin definingthreaded bolt 71. A vertically slotted yoke 72 engages and straddles pin71 and is mounted at the end of a slide rod 73 reciprocated by asolenoid 74 when the needle bar is in its raised position, as describedin the above referred to Patent No. 2,914,010.

The feed dog actuating mechanism includes a laterally extending shaft(FIGURES 1 and 2) journalled in a depending bracket 77, and rocked inthe conventional manner in synchronism with the longitudinalreciprocation of needle bar 13. Shaft 76 carries a pair of laterallyspaced, upwardly directed rocker arms 78 which support between them alaterally extending axle 79. A feed dog supported bracket 80 comprises alongitudinally extending arm 81 terminating at its forward end inlaterally extending sleeve 82 rockably engaging axle 79, and having anend section 83 of reduced outside diameter (FIGURE 5). An uprightsupport block 84 is formed at the trailing end of bracket arm 81.Depending from bracket arm 81 forward of its rear end is a leg 86 onwhich is mounted a rearwardly directed yoke member 87 having upper andlower parallel arms. Registering with yoke member 87 is an eccentricwheel 88 rotated by a shaft S9, in conventional manner, in synchronismwith the vertical movement of needle bar 13. Thus, a vertically andlongitudinally reciprocating movement is imparted to the bracket 80.

Feed member 90 is mounted on support block 84 in alignment with plateopening 12, and consists of a pair of laterally spaced, longitudinallyextending feed dogs 91 having serrated upper faces 92 and arcuatelyshaped concave underfaces 94, a Vvertical aperture 96 bein formed ineach feed dog 91 in vertical alignment with corresponding needles 14 andextending between the feed dog upper and lower faces 92, 94. Feed dogs91 are mounted atop a vertical medial web 97 and separated by anintermediate longitudinally extending groove 98. Projecting rearwardlyfrom web 97 and feed dogs 91, and downwardly offset relative to dogs 91,is an arm 99 disposed atop block 84 and secured thereto by suitablescrews. The lower, front and rear edges of web 97 are provided withoppositely directed peripheral anges 100, 101 and 102 respectively,front flanges 101 terminating at a point below underface 94 of the feeddogs to delineate passageways 103 on opposite sides of the web 97.

A pair of laterally spaced parallel bell cranks 104 are disposed onopposite sides of lower ange 100 and are pivoted thereto by a pin 106extending through the knee portion thereof. Each bell crank 104 includesa depending arm 107 and a forwardingly projecting shorter arm 108terminating in an inwardly directed lug 109 (FIG- URE 6). A dual lowerthread engaging and cutting member 110 is of arcuate configurationcorresponding to the curvature of feed dog underface 94, and includes afront cross piece 111 extending between the rear faces of lugs 109 andsecured thereto by suitable screws 112. Projecting rearwardly from thecross piece 111 are a pair of laterally spaced cutter or finger elements113 each of which engages feed dog arcuate underface 94 on oppositesides of web 97 which registers with the space separating the cutterelements 113. Each cutter element 113 includes a leading section havinga longitudinal medial groove 116 formed therein which extends to thefront end of the cutter element 113 into registry with a rearwardlydirected recess 117 which is formed in the leading end of cutter element113 and is flanked by an outer long finger 118 and an inner shorterfinger 119. Groove 116 terminates at its trailing end in an upwardlyprojecting cross shoulder 120 having an upper sharp edge which engagesunderface 94 of the feed dogs and cooperates with the sharp rear bottomedge of needle aperture 96 to define a thread cutting system therewith.Conventional bobbin devices 121 are associated with feed dogs 91, and aguide pin 122 depends from the outer edge of one of the feed dogs 91 todirect the corresponding bobbin thread properly.

A vertical rocker arm 123 is provided at its upper end with a splitcollar 126 engaging sleeve section 83 and locked thereto by a suitablescrew 127 which engages both elements of collar 126; Arm 123 carries atits lower end a laterally projecting leg 128terminating in a forwardlyprojecting lug 129 (FIGURE 5). A bell crank 130 comprises a U-shapedknee section 131 which is pivoted to the lug 129 by a substantiallyVertical pin 132 and includes an arm 133 projecting rearwardly from theupper leg of knee section 131 and having an aperture formed thereinadjacent its free end, and an arm 134 projecting laterally from thelower leg of the knee section 131. The ends of the bell crank arms 107and 134 are connected by a coupling member 136 (FIGURE 1) which includesa pair of laterally spaced longitudinally extending parallel links 137joined by a rivet 138 which carries a spacer collar 139 separating links137. The rear ends of links 137 have laterally aligned apertures formedtherein which engage a coupling ball 140 provided with outwardlydirected opposite pins 141 registering with apertures formed in the endsof bell crank arms 107. A coupling ball 142 is mounted atop a shank 143supported by and projecting upwardly from the free end of bell crank arm134 and registers with apertures formed in the corresponding free endsof links 137.

A connecting rod 144 is provided at one end thereof with a yoke member145 having aligned apertures or seats formed in the arms thereof whichengage a coupling ball 146. Coupling ball 146 registers with an apertureformed in the free end of bell crank arm 136. The opposite end of theconnecting rod 144 is iiattened, as at 147, and is pivotally connectedby a shoulder screw 148 to the underlock screws on shaft 151 at oppositeends of bushing 152.

A cam plate 154 is provided with a depending huby 156 also aflixed tothe upper end of the shaft 151. Cam plate 154 has formed therein adiagonal slot 157 slidably engaged by a Vertical follower pin 158depending from the free end of a reciprocating rod 159 motivated by asolenoid 160. Solenoids 74 and 160 are simultaneously energized anddeenergized to advance and retract rods 73 and 159 respectively toeffect the upper and lower thread cutting strokes, rods 73 and 159 beingretracted by springs or other means, such as a cooperating solenoid. Itshould be noted that a single solenoid system may be employed tomotivate both the upper and lower thread cutting mechanisms. The systememployed in the above-identitied Cohen patent may be employed toadvantage in this connection.

Considering now the operation of the above described thread cuttingmechanism, the cutting stroke is effected automatically when needle bar13 and needles 14 are in their fully raised position and feed dogs 91are in their depressed positions, by the momentary energization of thesolenoilds 74 and 160. Energization of solenoid 74 advances rod 73 andyoke 72 to the right, as seen in FIGURE 3 of the drawings, to swing bellcrank 70 clockwise which, in turn, swings yoke 52 clockwise, as seen inFIGURE 2. Yoke 52, by way of arm 5S, advances cutter member 37 forwardlyalong the passageways 28 and 29. During the initial part of the advancestroke of cutter 37, the leading inclined edges of the upper and lowercutter elements 39 and 40 pass across openings 30 and 24 and engage thecorresponding upper threads T tot urge them laterally inwardly againstthe side edges of openings 24 and 30 (FIGURES 14 and 14a). When cutter37 reaches the end of its advance stroke, the cutter hook edges 44 and43 pass beyond threads T which spring back into longitudinal andconfronting alignment with threads T (FIGURE 15). Cutter 17 is thenretracted, and during the initial part of its return stroke, threads Tare engaged by hook edges 48 of the upper cutter 39 and are drawnrearwardly into passageway 28 (FIGURES 16 and 16a). As the return strokecontinues, the hook cutting edges 44 of lower cutter 40 pass across thecorresponding aperture, cutting edges 32, to effect a severing ofthreads T, the lower ends of the upper sections of which are engagedbetween the confronting walls of upper cutter element 39 and plate 26(FIGURES 17 and 17a). The cutter member 37 then returns to its fullyretracted position (FIG- URES 11 and l2) to complete the upper threadcutting stroke.

The cutting of the bobbin threads B is effected by the energization ofsolenoid 160 which advances rod 159 to the left, as seen in FIGURE 1,and rocks cam plate 154 and arm 149 counterclockwise. Arm 149, by way ofconnecting rod 144, rocks bell crank 130 clockwise which, in turn, byway of coupling member 136, rocks bell crank 104 clockwise as seen inFIGURE 2, to advance cutter member along its stroke from its retractedposition (FIGURE 8). During the initial part of the cutting stroke, theleading section 114 of each of cutter element 113 passes across theneedle aperture 96, the cutter element end recess 117 engaging thecorresponding thread B to draw thread B in registry with groove 116 inthe cutter element along the confronting feed dog underface 94 (FIGURE9). Upon further advance of cutter member 110, the cutting edges passacross needle apertures 96 to sever threads B against the trailaiesfeaeing lower sharp edges of apertures 96 (FIGURE 10). Upon de-energizationof solenoid 160, cutter membe-r 110 is withdrawn by the motivatinglinkage to` its retracted position to complete the cutting cycle.

It is important to note that the rod 144 is substantially perpendicularto the plane of movement of the feed dogs 91. As a consequence, thenormal movement of feed dogs 91 during the normal sewing operationimparts insignificant longitudinal movement to rod 144 and hence doesnot affect the movement of cutting element 113 in relation to the feeddogs 91 during the normal sewing operation.

While there has been described and illustrated a preferred embodiment ofthe present invention, it is apparent that numerous alterations,omissions and additions may be made without departing from the spiritthereof.

We claim:

1. A sewing machine comprising a reciprocating needle, a feed degreciprocating across the path of said needle, a thread cutting member,means moving said thread cutting member in synchronsim with said feeddog, and remotely actuatable means for selectively moving said threadcutting member relative to said feed dog independently of the movementthereof.

2. A sewing machine comprising a reciprocating needle, a work advancingfeed dog synchronously reciprocating across the path of said needle andhaving upper and lower faces and an opening formed therein between saidupper and lower surfaces, a thread cutting member mounted on andsynchronously movable with said feed dog, and means for selectivelyreciprocating said thread cutting member in a path along said feed doglower face and across said opening.

3. A lock stitch sewing machine comprising a vertically reciprocatingneedle, a feed dog reciprocating in synchronism with said needle andhaving top and bottom faces and a vertical aperture in alignment withsaid needle, a thread cutting element mounted on and synchronouslydriven with said feed dog and movable relative to said feed dog in apath along said feed dog bottom face and across said aperture, and meansfor selectively reciprocating said cutting element along said path.

4. A sewing machine according to claim 3, wherein said feed dog bottomface and said cutting element are of substantially complementary arcuateconfiguration.

5. A sewing machine according to claim 3, wherein said cutting elementincludes a leading section having a longitudinally extending surfacedisposed below said feed dog bottom face and a cutting edge trailingsaid leading section and substantially abutting said feed dog bottomface.

6. A sewing machine according to claim 3, wherein said cutting elementhas a recess formed in its leading end.

7. A sewing machine according to claim 6, wherein said recess is flankedby a pair of forwardly directed legs of different lengths.

8. A lock stitch sewing machine comprising a vertically reciprocatingneedle, a feed dog havingr a serrated top face and a cylindrical bottomface and a vertical aperture formed therein communicating with said topand bottom faces, means for imparting vertical and longitudinalreciprocating motion to said feed dog in synchronism with said needle, asupport arm swingably mounted relative to and movable with said feeddog, an arcuate cutting element mounted on and circumferentiallyextending from said support arm and engaging said feed dog bottom face,and means for rocking said support arm to selectively reciprocate saidcutting element across said aperture.

9. A sewing machine according to claim 8, including a bracket dependingfrom said feed dog, said support arm being pivoted to said bracket.

10. A lock stitch sewing machine comprising a bracket, a feed dogmounted on said bracket and having top and bottom faces and an aperturecommunicating with said faces, means for imparting a longitudinallyreciprocating motion to said bracket, a first bell crank pivoted about ahorizontal axis to said bracket and including a depending irst leg and alongitudinally projecting second leg, a cutter element mounted on saidsecond leg and engaging said feed dog bottom face and movable acrosssaid aperture upon the rocking of said first bell crank, a second bellcrank supported by said bracket and pivoted about a vertical axis andincluding a laterally extending third leg and a longitudinally extendingfourth leg, a link connecting said first and fourth legs, and meansconnected to said third leg for rocking said second bell crank.

11. A sewing machine according to claim 10, wherein said means forrocking said second bell crank includes a connecting rod reciprocatablealong the length thereof in a direction substantially perpendicular tothe plane ofy motion of said bracket.

References Cited in the tile of this patent UNITED STATES PATENTS521,308 Dahl June 12, 1894 639,726 Grieb Dec. 26, 1899 902,532 HayesOct. 27, 1908 1,010,830 Weis Dec. 5, 1911 1,883,654 Ericsson Oct. 18,1932 2,372,318 Enos Mar. 27, 1945 2,376,417 Chudner May 22, 19452,591,447 Loomis Apr. 1, 1952 2,707,927 Artzt et al May 10, 19552,846,967 Doerr et al Aug. 12, 1958 2,914,010 Cohen Nov. 24, 19593,068,819 Hedegaard Dec. 18, 1962

1. A SEWING MACHINE COMPRISING A RECIPROCATING NEEDLE, A FEED DOGRECIPROCATING ACROSS THE PATH OF SAID NEEDLE, A THREAD CUTTING MEMBER,MEANS MOVING SAID THREAD CUTTING MEMBER IN SYNCHRONISM WITH SAID FEEDDOG, AND REMOTELY ACTUATABLE MEANS FOR SELECTIVELY MOVING SAID THREADCUTTING MEMBER RELATIVE TO SAID FEED DOG INDEPENDENTLY OF THE MOVEMENTTHEREOF.